JP3742479B2

JP3742479B2 - Bladeless impeller for submersible pump

Info

Publication number: JP3742479B2
Application number: JP06255497A
Authority: JP
Inventors: 一夫飯坂
Original assignee: Tsurumi Manufacturing Co Ltd
Current assignee: Tsurumi Manufacturing Co Ltd
Priority date: 1997-02-27
Filing date: 1997-02-27
Publication date: 2006-02-01
Anticipated expiration: 2017-02-27
Also published as: JPH10238495A

Description

【０００１】
【発明の技術分野】
本発明は、水中ポンプ用ブレードレス形羽根車に関するものである。
【０００２】
【従来技術とその問題点】
ブレードレス形羽根車においては周知のように、シュラウド裏面の要所要所にドリルで浅く穿孔を施すなどして個々の羽根車の重量バランスの修正を行っている。
【０００３】
しかしこれによって気中での回転による軸振れは解消し得ても、肝心の水中での回転時には円弧状羽根板の小径部よりも大径部、とりわけ最大外径部付近から中心方向へ加わる圧力が大きいため、水力学的アンバランスが発生し、これが軸振れや振動の原因となり、軸受の寿命を縮める要因にもなっている。
【０００４】
【発明の目的】
本発明の目的は、水中での回転時における水力学的アンバランスを解消し、軸振れや振動の生じない水中ポンプ用ブレードレス形羽根車を提供することにある。
【０００５】
【発明の構成】
本発明に係る水中ポンプ用ブレードレス形羽根車では、吸込口の上方部周辺から外周方向へ漸次大径となるよう円弧状に曲成された羽根板に沿って中央の羽根入口より側方の羽根出口へ至る通水路を有する羽根車本体の上面もしくは下面または上下両面に環状のシュラウドを添合させてなる水中ポンプ用ブレードレス形羽根車において、環状シュラウドの円周方向の一定境域を鞘状の液体容入室に形成し、液体容入室の形成境域と円弧状羽根板の大径部とが合致する位置において環状シュラウドと羽根車本体とを一体状に定着させ、水中での羽根車の回転時に円弧状羽根板の大径部の外側から羽根車軸に加わる側圧が、液体容入室の外周壁内面を遠心力で押圧する容入液体の作用によって減殺されるよう構成した。また、液体容入室には要すれば容入用の窓を設け、更に要すれば排気手段を併設する。
【０００６】
【実施例】
以下実施例の図面により説明をする。
【０００７】
１は羽根車本体であって、吸込口２の上方部周辺から外周方向へ漸次大径となるよう円弧状に曲成された羽根板３の上下にフランジ４，４を張設し、中央の羽根入口より側方の羽根出口へ至る通水路５を有し、かつ、上下フランジ４，４の盤面には円周方向へ等開度に多数のネジ孔６‥‥６が配設されている。７，７は羽根車本体１の上下フランジ４，４に添合される環状のシュラウドであって、そのほぼ半周部を平面扇形で鞘状の液体容入室８に形成し、残りのほぼ半周部は肉厚の増大された平面扇形のバランスウエイト９に形成し、かつ、前記ネジ孔６‥‥６に対向する複数のボルト孔１０‥‥１０が盤面の円周方向へ等開度に配設されるが、これらボルト孔１０‥‥１０は、六角穴付ボルト１１の頭部が陥没するよう段付孔に形成されている。液体容入室８には容入用の窓１２が設けられているが、この窓１２は液体容入後に閉塞される構造であってもよく、また、常時開放されていてポンプを水中に沈めたとき窓１２から液体容入室８内に水が入るという構造でもよく、後者の場合、羽根車の回転方向に向かって液体容入室８の先端部近くの周壁に設けられていることが望ましい。更にまた、水中での回転時にその回転方向から液体容入室８内へ水を流入させるという方式であってもよいが、この場合には液体容入室８内の空気を排出させるための排気路（図示せず）を併設することが必要となる。
【０００８】
組立時には、液体容入室８の形成境域と円弧状羽根板３の大径部３ａとが合致するよう円周方向に位置合わせをし、ボルト孔１０‥‥１０を通じて六角穴付ボルト１１‥‥１１のネジ部をネジ孔６‥‥６に螺合させることで、環状シュラウド７と羽根車本体１とが一体状に結合される。そしてバランスウエイト９が円弧状羽根板３の小径部３ｂ方向に位置することになるため、羽根車の重量バランスが良好となる。
【０００９】
【作用】
ポンプを水中に沈めたとき、窓１２から液体容入室８内に水が入り、ポンプ運転中は液体容入室８内の水に遠心力が働き、水力学的アンバランスに対する付加質量となる。つまり、水中での羽根車の回転時に円弧状羽根板３の大径部３ａの外側から羽根車軸１３に加わる側圧Ｄが、液体容入室８の外周壁内面１４を遠心力Ｅで押圧する容入液体の作用によって減殺されるのである。液体容入室８内に予め液体を容入して窓１２を閉塞した場合でも、水中でのポンプ運転時には容入液体の作用によって水力学的アンバランスに対する付加質量となることは言うまでもない。
【００１０】
【発明の効果】
本発明によれば、水中での回転時における水力学的アンバランスを解消し得られ、振れや振動を生じることがなく軸受の寿命を高め得る、水中ポンプ用ブレードレス形ポンプを提供することができるのである。
【図面の簡単な説明】
【図１】本発明に係る水中ポンプ用ブレードレス形羽根車の縦断側面図である。
【図２】本発明に係る水中ポンプ用ブレードレス形羽根車における羽根車本体の平面図である。
【図３】図２のＡ−Ａ線における縦断側面図である。
【図４】本発明に係る水中ポンプ用ブレードレス形羽根車における羽根車本体の底面図である。
【図５】本発明に係る水中ポンプ用ブレードレス形羽根車における羽根車本体の上面から定着されるシュラウドの底面図である。
【図６】図５のＢ−Ｂ線における縦断側面図である。
【図７】本発明に係る水中ポンプ用ブレードレス形羽根車における羽根車本体の下面から定着されるシュラウドの平面図である。
【図８】図７のＣ−Ｃ線における縦断側面図である。
【図９】本発明に係る水中ポンプ用ブレードレス形羽根車の水中での回転時における水力学的アンバランスの解消原理を示す説明図である。
【符号の説明】
１羽根車本体
２吸込口
３羽根板
３ａ羽根板の大径部
５通水路
７シュラウド
８液体容入室
１２窓
１３羽根車軸
１４液体容入室の外周壁内面
Ｄ側圧
Ｅ遠心力[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bladeless impeller for a submersible pump.
[0002]
[Prior art and its problems]
As is well known in the bladeless type impeller, the weight balance of each impeller is corrected by shallowly drilling a necessary portion on the back surface of the shroud with a drill.
[0003]
However, even though this can eliminate shaft run-out due to rotation in the air, the pressure applied to the center from the large-diameter portion, especially near the maximum outer-diameter portion, is smaller than the small-diameter portion of the arcuate blade when rotating in water. Therefore, hydraulic imbalance occurs, which causes shaft runout and vibration, and also shortens the bearing life.
[0004]
OBJECT OF THE INVENTION
An object of the present invention is to provide a bladeless impeller for a submersible pump that eliminates hydraulic imbalance during rotation in water and does not cause shaft runout or vibration.
[0005]
[Structure of the invention]
In the bladeless type impeller for submersible pumps according to the present invention, the blade blades are located on the side of the blade inlet side from the central blade inlet along the blade plate that is curved in an arc shape so as to gradually increase in diameter from the periphery of the upper portion of the suction port toward the outer periphery. In a bladeless impeller for submersible pumps, in which an annular shroud is joined to the upper surface, lower surface or both upper and lower surfaces of an impeller body having a water passage leading to the blade outlet, a constant boundary in the circumferential direction of the annular shroud is a sheath shape The annular shroud and the impeller body are fixed integrally at a position where the formation boundary area of the liquid containing chamber and the large diameter portion of the arcuate vane coincide with each other, and the impeller rotates in water. The lateral pressure applied to the impeller shaft from the outside of the large-diameter portion of the arcuate vane plate is sometimes reduced by the action of the filling liquid that presses the inner surface of the outer peripheral wall of the liquid containing chamber with centrifugal force. Further, if necessary, the liquid storage chamber is provided with a window for receiving, and if necessary, an exhaust means is additionally provided.
[0006]
【Example】
Hereinafter, description will be made with reference to the drawings of the embodiments.
[0007]
1 is an impeller body, and flanges 4 and 4 are stretched on the upper and lower sides of a vane plate 3 that is bent in an arc shape so as to gradually increase in diameter from the periphery of the upper portion of the suction port 2 toward the outer periphery. There is a water passage 5 from the blade inlet to the blade outlet on the side, and a number of screw holes 6... 6 are arranged at equal openings in the circumferential direction on the surface of the upper and lower flanges 4, 4. . 7 and 7 are annular shrouds joined to the upper and lower flanges 4 and 4 of the impeller body 1, and a substantially half-circumferential portion thereof is formed in a flat fan-shaped sheath-like liquid storage chamber 8, and the remaining substantially half-circumferential portion Is formed in a flat fan-shaped balance weight 9 having an increased thickness, and a plurality of bolt holes 10... 10 facing the screw holes 6. However, these bolt holes 10... 10 are formed in stepped holes so that the heads of the hexagon socket head cap bolts 11 are depressed. The liquid containing chamber 8 is provided with a window 12 for filling. However, the window 12 may be closed after the liquid is filled, and is always open and the pump is submerged in water. Sometimes, the structure may be such that water enters the liquid containing chamber 8 from the window 12, and in the latter case, it is desirable to be provided on the peripheral wall near the tip of the liquid containing chamber 8 in the rotational direction of the impeller. Furthermore, a method may be used in which water flows into the liquid storage chamber 8 from the direction of rotation when rotating in water, but in this case, an exhaust path for discharging air in the liquid storage chamber 8 ( (Not shown) is required.
[0008]
At the time of assembly, alignment is performed in the circumferential direction so that the formation boundary region of the liquid containing chamber 8 and the large-diameter portion 3a of the arc-shaped blade plate 3 coincide with each other, and the hexagon socket head cap bolt 11 through the bolt hole 10. Are screwed into the screw holes 6..., So that the annular shroud 7 and the impeller body 1 are integrally coupled. Since the balance weight 9 is positioned in the direction of the small diameter portion 3b of the arcuate blade 3, the weight balance of the impeller is good.
[0009]
[Action]
When the pump is submerged in water, water enters the liquid storage chamber 8 from the window 12, and centrifugal force acts on the water in the liquid storage chamber 8 during the pump operation, resulting in an additional mass with respect to hydraulic imbalance. That is, the side pressure D applied to the impeller shaft 13 from the outside of the large-diameter portion 3a of the arc-shaped impeller 3 during rotation of the impeller in water presses the outer peripheral wall inner surface 14 of the liquid containing chamber 8 with the centrifugal force E. It is attenuated by the action of the liquid. Needless to say, even when the liquid is previously filled in the liquid containing chamber 8 and the window 12 is closed, when the pump is operated in water, an additional mass with respect to the hydraulic imbalance is caused by the action of the containing liquid.
[0010]
【The invention's effect】
According to the present invention, it is possible to provide a bladeless pump for a submersible pump that can eliminate a hydraulic imbalance during rotation in water and can increase the life of a bearing without causing vibration or vibration. It can be done.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a bladeless impeller for a submersible pump according to the present invention.
FIG. 2 is a plan view of an impeller body in a bladeless impeller for a submersible pump according to the present invention.
FIG. 3 is a longitudinal side view taken along line AA in FIG. 2;
FIG. 4 is a bottom view of an impeller body in a bladeless impeller for a submersible pump according to the present invention.
FIG. 5 is a bottom view of the shroud fixed from the upper surface of the impeller body in the bladeless impeller for submersible pump according to the present invention.
6 is a longitudinal side view taken along line BB in FIG. 5;
FIG. 7 is a plan view of a shroud fixed from the lower surface of the impeller body in the bladeless impeller for submersible pump according to the present invention.
8 is a longitudinal side view taken along the line CC of FIG. 7;
FIG. 9 is an explanatory diagram showing the principle of eliminating hydraulic imbalance when the bladeless impeller for a submersible pump according to the present invention rotates in water.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Impeller main body 2 Suction port 3 Blade plate 3a Large diameter part 5 of a blade plate Water flow path 7 Shroud 8 Liquid storage chamber 12 Window 13 Impeller shaft 14 Outer peripheral wall inner surface D of liquid storage chamber Side pressure E Centrifugal force

Claims

The upper surface of the impeller body having a water passage extending from the central blade inlet to the side blade outlet along the vane plate curved in an arc shape so as to gradually increase in diameter from the periphery of the upper portion of the suction port toward the outer circumference or In a bladeless impeller for submersible pumps, in which an annular shroud is joined to the lower surface or both upper and lower surfaces, a constant boundary in the circumferential direction of the annular shroud is formed in a sheath-like liquid inlet chamber, and the formation area of the liquid inlet chamber The annular shroud and the impeller body are fixed integrally at a position where the large diameter portion of the arcuate blades and the arcuate blade plate coincide with each other. A bladeless impeller for a submersible pump, characterized in that the lateral pressure applied to the submersible pump is reduced by the action of the liquid that presses the inner surface of the outer peripheral wall of the liquid container with centrifugal force.

2. The bladeless impeller for a submersible pump according to claim 1, wherein a window for containing the liquid is provided in the liquid containing chamber.

2. A bladeless impeller for a submersible pump according to claim 1, wherein a window for containing the liquid is provided in the liquid containing chamber and an exhaust means is also provided.